Step exercise apparatus



FIG. 1 is a perspective view of the step exercise apparatus, showing my new design;

FIG. 2 is a right view of the step exercise apparatus of FIG. 1;

FIG. 3 is a left view of the step exercise apparatus of FIG. 1;

FIG. 4 is a front view of the step exercise apparatus of FIG. 1;

FIG. 5 is a rear view of the step exercise apparatus of FIG. 1;

FIG. 6 is a top view of the step exercise apparatus of FIG. 1; and,

FIG. 7 is a bottom view of the step exercise apparatus of FIG. 1.

The broken lines shown in the figures are for the purpose of illustrating portions of the step exercise apparatus, which form no part of the claimed design. 

CLAIM The ornamental design for a step exercise apparatus, as shown and described. 